DE1508772A1 - Method and device for the production of metallic injection molding - Google Patents

Description

Dr. Hugo Wildcen 24 tob *, H. November 1966 Wide Straft 52-54

Patent attorney Hmmh lob.dt (045ΐ) 7ΜΜ _

Curau (04505) 210 (Prfvrt) HT · F

Arider, 1508772

Associated Engineering limited, 60 Kenilworth Road, Ieamington Spa, Warwickshire, England

■ M IM 'M4 MW M «" ■ *** ^ "M M * MM MW-« W «w'« W ^ Ht · ^ ■■ * * ■ · M * WW ■ "* * ■ *> ^ * ■■> ■■ * * "■ '■■ ** · ** ** ■ X * ■■ * Process and device for the production of metallieohem Injection molding

The invention relates to methods and apparatus for making metallic injection molding, in particular from Leiohtlegjarungen based on το η AH umi nium and magnesium and in particular to improvements in the low-pressure injection molding process of the known type.

To this day, “Hiederdruok fuel casting is generally used ■ o carried out »that a crucible or pot is provided in the the metal to be cast is kept in the saturated state and into which a transport protrudes »leading to a matrix · or form guides the crucible or pot is closed so that a bridge can be exerted on the surface of the molten salt, in order to push the molten metal through the transport tube into the blank or die. With such an arrangement, the whole area above the Sohmelxenfläohe set under Druok and "was every time a casting is made. Although this system works perfectly for large cast pieces, it is inadequate and uneconomical for the casting of small parts.

The object of the invention is therefore to provide a better Process and a better device for injection molding ν · η

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To reach metals, which avoids that the whole crucible or the pot containing the malt is tightly sealed, and which avoids the whole area above the Sohmelze must be put under Druok »

Another object of the invention is to provide a To achieve a method and apparatus for the injection molding of metals which allows multiple shapes to be achieved or matrices are fed simultaneously from the same molten salt and what are the different pouring times and / or if necessary to be used for the different parts to be cast in different shapes or matrices «

BaOH a solution of the invention, tin method is provided for injection molding, atrizen where dl 'in one or more ffermtn or ^M metal to be cast melt is maintained below atmospheric or ambient pressure and at dtr the gttchmolzeae metal is caused duroh application "ines printed on a limited area of the red ^{ointment to flow into every form or m} atrize, whereby this pressure is above the pressure in the form or ^m atrize.

Dtr Traneport of the molten metal from the Sohmelze to the odtr each form or * die can either alone duroh Application tints of gas pressure on the surface of the molten metal or duroh evacuation dtr Matrizt odeJy duroh gtmtinamt Use of printing tools that are placed on the surface of the melted Metal agsgtbUbt is carried out on the form or matrix is, so that tin is sufficiently large overpressure on the surface of the gtMhmolftntn metals are exercised in order to

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to flow into the mold or die.

The pressure medium can be a suitable gas, advantageously a gas inert to the metal to be cast. The bruoic / time characteristic can be controlled by "known means" An eddy-free flow of molten metal into the mold or die, the pressure then increasing is used to effect the feeding as soon as the casting solidifies. If desired, the circle producing the Druok can be such that the pressurized gas is reintroduced into the circuit will.

The invention further consists of a device for Injection molding of metals and aioh is characterized by a closed pressure vessel, which is at least partially in a closed pouring molten metal immersed and which has a valve through which molten metal can enter the boiler and which further comprises a transmission line that sioh in the boiler extends to the molten metal of a mold or Feed the die via this transport line.

As mentioned above, the overhead conduction of the molten metal into the mold or die can either be daduroh caused that a pressure is exerted on the surface 4 × β of molten metal within the kettle that the Die or mold is evacuated or that the pressure values are applied in combination, which are applied to the boiler and the die be exercised to cause the molten metal flows in the desired way "

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That part of the transport tube that runs along the pressure vessel and the entry into the mold or die can be be provided with means for heating the pipe to the duroh to keep the pipe flowing metal in the molten state

According to a preferred embodiment of the invention, a nozzle is provided at the entry of the transport tube into the mold or die arranged, and this nozzle designed so that they do the desired Casting properties for the mold or die used result. Preferably, the nozzle is arranged quickly interchangeable, so that parts of different types for different shapes or Matrices can be used.

The invention will now be explained on the basis of an exemplary embodiment the drawing explained, namely point

1a, 1b and 1o show an embodiment in the sohematisohen Sohnltt

for a method for the injection molding of metal according to the invention,

Fig. 2 shows a part with details of the'Vorriohtungeausbildung, as they are for the method naoh Invention is used,

3 shows a plan view of the molds and the associated control device,

Fig. 4 is a block diagram of a control system for the device according to the invention.

According to Fig. 1a, 1b and 1o, a crucible or pot is shown which contains the molten metal 2, and in the partially a pressure vessel 3 is immersed. The pressure vessel is in its Bodenfläohe with a valve 4 pass, and in his Upper surface with a line 5, through which a gas pressure to the boiler can be supplied under control of the valve 6. These" Valve also controls the opening and closing of a gas outlet

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A transfer or transport pipe 8 runs close to the ground of the pressure vessel to a mold or die 9 'arranged outside the pressure vessel. The form or die is in two parts around a to enable borrowed removal of a casting from the mold, and known means for optional heating or cooling can be used the mold or die are provided in order to achieve a perfect casting.

At the beginning of the casting process, the device is in the state according to FIG is now closed and a gas pressure is exerted on the metal surface in the boiler by controlling the valve via line 5, in such a way that the pressure in the mold is overwhelmed by a suitable amount, the molten metal is passed through the pipe 8 flow into the mold or die as shown in Fig. 1B · Once check the Gußstüok in the shape or ^M solidified atrize has the Druok is compensated, by actuation of the valve 6, whereby the interior of the Druokkessels with the Ausblaseauslaß 7 The mold or die 9 is then opened and the casting removed while the remaining molten metal in the tube 8 flows back into the kettle 3 for reuse, as shown in FIG st.

The execution naoh Fig. 2 and 3 is the Grundsätalioh same as in Fig. 1a and is particularly suitable for casting of Ai: -ium ^ umalloys. The crucible 1 sits in a conventional one Kiln 1a, which serves to place the molten metal2 in the

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To heat the crucible by any known means.

The pressure vessel 3 is trimmed in a niohtdargeatellter way, and "was such that he partly dipped into the Sohmelze 2, and is equipped with valve elements 20 and 21 belonging to one another. The durohbroohene valve seat 20 iat in the bottom of the Druokkessels attached and the associated Sohließglied 21 is connected to a control rod 22 which extends through the valve body 23. This valve can be controlled by compressed air which is fed through lines 24, and also through a weight 25. The valve mechanism is through a water jacket 26 on one? Maintained a suitable temperature and the water jacket 26 cooling water is supplied through lines 27. It's understandable, that the valve auoh duroh mechanical, hydraulic or electric Arrangements or you # oh gravity can be controlled.

A transport tube 28 extends from near the bottom of the pressure vessel and runs through the surface to a nozzle 29 in the die plate 30. The temperature of the exposed part of the transport tube is controlled by a heating element 31, which surrounds this pipe part

The switching control of the temperature of the transport pipe together with the design of the nozzle 29, its Thai properties, their depth and their profile will to a large extent determine the feeding and loading behavior of the casting » In fact, the nozzle works as a control area, with solidification at the inlet proceeding as quickly and as immediately as possible, while a relatively slow solidification is achieved in the area adjacent to the Tranaport tube »The nozzle 29

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is made easily interchangeable, so that depending on the Gußatüok bosom to be produced different types of construction are used can be. It can also be profiled to provide directional control for the supply of molten metal in each'Hohlraum 32 produced with a plurality of cavities form 23 or matrices. In this version there are two cavities 32, but it will be understood that a plurality of cavities or only a single cavity can also be provided can, depending on the size and nature of the out- ^ the casting.

The various metal components of the system are with provided with a ceramic coating or a ceramic covering, to prevent attack by the molten metal or to prevent contamination of the molten metal.

The mold or die 33 is made in two parts, to facilitate the removal of the casting, with the parts the mold against each other and away from each other by pressing 34 od < The like are movable, and the parts are pressed against one another by pressing 35 be bracketed.

Optional heating or cooling can be used if desired the mold or die by known means can be applied to to get a perfect casting.

The device is in the ready-to-use position with the open Valve 20,21 shown, and the molten metal in the crucible and in the pressure vessel are at the same level It will now be the operation of the device based on

Fig. 4 illustrates a block diagram of a control system

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shows sum control of the casting process. In Fig. 4 they divide the pneumatic line connections, the dash-dotted lines the electrical lines and the dashed lines represent the gas supply lines.

Hit the pneumatic and gas feeder controls, adjusted to the required pressures, and with the timers 1, 2 and 3, set to the appropriate times for the casting process, operate by depressing and releasing of push button 1 initiated · This causes them to eat the? ormhK £ f-th 33 close, whereupon a signal from the switching valve is fed to actuate the clamps 35. As soon as all the form halfs are clamped together, a signal is fed from the switching valve 37, which makes the push button 2 ready for operation. Any tall cores are required at this point inserted into the molds. The push button 2 is now depressed and released, and this ensures that the bottom valve 20, 21 in the pressure vessel 3 flows. As soon as «loh this Valve has closed, a signal via valve 58 is the pneumatisQh electrical converter 39 carried out, the tin druok « actuated Sohalter is what the start of the timers 1, 2 and 3 controls

The Druokgas standing under a Druok X is now flowing through inlet 40 into the pressure vessel 3 # µm to the surface to exert a pressure on the molten metal and to cause a corresponding Haohsteigcn in the transport tube 28 au. The Druok is now sufficient to remove the molten metal to lift into the form or die and close the form or die

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fill and this druok will be maintained until iftoh on the metal a skin "forms. Now the clockwork 1 comes into action» among other things Change Druokgas to a Bruok Y au that is larger than the Druok with which the actual injection molding is completed. The Äeitwerk 2 is intended for the optional removal of ven learning, if this is necessary before the full solidification and the tail unit 3 works so that the Druokgasaufuhr is switched off and the pressure vessel is emptied by pressure gas. This Davokgas will either ejected at ambient pressure or the gas can again ^

can be used in the circuit. At the end of this process, a signal from the timer 30 verifies that the valve 20, 21 opens and when this occurs, a signal from the hold valve 38 makes the push button 3 ready for use. The cores used are now unloaded. The Druokknopf is then niedergedrüokt and released, whereupon the jaws are withdrawn 35, and a signal from the Sohaltvevntil 37 veruraaoht as £ fled open the mold halves dureh operation of the presses 34 · Bin signal from the Sohaltventil 36 now maoht the Druokknopf 1 hardening a ready to allow a further oiling process to take place as soon as the previously produced OufistUok or the previously produced OuBstüoke have been removed from the molds, the type of metal melting furnace, and also the type of crucible 1 or the like, are part of the invention. which absorb the molten metal, relatively unlikely "

The pressure vessel and its auxiliary equipment such as the transport tube, the mold or die and the associated components are thus formed a separate arrangement of the device, which is also able to

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applied to existing furnace furnaces to "earth" a aolohen oven iu one ail; Ii β to convert the pressure-working injection molding unit to supply several matrices, wotei the Number of units of the immersed apparatus, which are arranged around the crucible or pot, generally only duroh the available space is limited.

It should also be emphasized that different forms for the production of different Oußetüoke with unterohiedliohen Units can be used to carry out various pouring operations and meal times and that, therefore, different lower parts, which require different injection and food items, casting pressures and processes, are smooth can also be poured into the same molten metal.

The detailed execution of such a system " depends on the specific application, the materials used for the construction and the hardening properties of the concerned alloy. Is there materials available that Allow a successful operation, alumjtam and magnesium based alloys and other metals and alloys with deeper solidification points. Alloys with a relatively narrow solidification range are am leiohteeten to pour successfully.

Bas pressure medium is most simply compressed air, but inert gases, e.g. B. nitrogen, argon, Carbon dioxide can be used. It is desirable that the ratios of Druok to flow rate and time be accurately controlled in order to ensure optimal filling and feeding

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· It is also desired that the molten metal should climb up rather slowly »until the mold or die roll is whereupon the pressure can be quickly increased bie it reaches its maximum value, which is normally below 10 p.e.i.g. lies·

It is understandable that various amendments have been made can be made within the scope of the invention can, for example, the boiler 3 can be made of ceramic material, the transport tube being a unitary part of the boiler

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Claims (1)

Patents 1. SpritEgußverfahren, known that a In one or more molds or matrices bu potting metal sleeve is held on Atmoepharendruok or Umgebungedruok and the perfect metal by applying a Druokee on the surface of the Sohmelee, and was about a limited Bereloh the Sohmelze is induced in any form or die eu flow, with the applied Druok above the Druokee in the form or matrix. 2. The process of injection molding simultaneously in several Forms or matrices, because you know without the fact that the eu shedding metal ohms on atmospheric or ambient pressure is held and that the metal is permeable through the application of a · Druokee on the surface of the Sohetlee, and iwar over several delimited areas of the Sehmelse each of which is a Vorm or Die is arranged, caused to be in each Vorm or die eu flow 3. Procedure according to Aneprueh 1 or Z ₉ daduroh marked that the transfer of the geeohmolsenen Metals aue the Sohmelse bu every Vorm or Matriee solely by application of an "aasdruokee on the surface of the related metals. 4. Procedure according to Claim 1 or 2, because it is known that the transition of geeohmolsenem metal aue the bohmelee in every Vorm or Matrise duroh application elnee Oaedruoke · 9098 ^ 5/0272 - 13 - on the surface of the molten metal and a smaller one Pressure on the or a partial slackening of the form or Die is effected 5. Method naoh one of the previous claims, characterized characterized in that the molten metal is heated during the overflow of the melt into the mold or die is held. 6. Device for the SpritzgieBen of metal, gekennezeiehnet duroh geeohloeaenen a pressure vessel (3), of at least "μ partially in a mat to be cast Metalleehmelze (2) eintauoht, and which has a valve (4) through which the molten metal enters the boiler and a discharge pipe (8) which protrudes into the kettle to form the molten metal or to feed the die (9) connected to the transfer tube (8) 7 device for injection molding τοη metal, marked duroh a container (t) for daa molten metal (2), durth means for heating the container, duroh at least one closed Sruokkessel (3) »which at least partially in the The molten metal to be cast (2) is thawed and a valve (4) owns, duroh dai the Gesohmolsen · metal in the boiler and in a transfer pipe (|) enters, welohee into the boiler »· protrudes to the molten metal one on the catenary ear connected mold or die. 8. The device according to claim 5 of C _9, characterized by means for applying a pressure to the surface of the molten metals within a boiler (3). 909845/0272 - 14 -. 9. Device naoh lnepruoh 5 or 6, marked by means of applying a gas pressure to the surface of the molten metal in a kettle (3) in connection with Means of applying a lesser druoke to the or one at least partial evacuation of the mold or die (9) 10. Device according to one of the 6 to 9 »daduroh marked that the part of the »catenary pipe (8 or 26) the between the pressure vessel (3) and the entry into the Vorm * or die (30), with means (31) for heating the pipe is provided to keep the metal flowing through the pipe in a molten state 11 · Device according to one of claims 6 to 10, thereby characterized that a «nozzle (29) at the transition swisohem dem Catenary pipe (3, 28) and the mold or die (30, 33) is provided, which is designed so that it produces the usual oe properties for the particular mold or die used. 12. Device according to one of claims 6 to 11, daduroh characterized in that the bottom valve C4) between. 20,21) of the pressure vessel »(3) is operated hydraulically or pneumatically. 13 device according to one of claims 6 to 11, daduroh characterized in that the bottom valve (4 or 20,21) is actuated at least partially duroh a weight (25). 14. Device according to one of Claims 6 to 13, daduroh marked that the overhead line pipe (8, 28) with the pressure vessel (3) is made as a coherent unity 15 · Device according to one of the claims 6 to 14, characterized by the means that the use is rare 909845/0272 ORIGINAL BATHROOM - 15 - sweoks floodplain exercise tines Bruok ·· on the surface die gesohmolsensn Metal in the or in each pressure vessel (3) in the circuit surUo is routed * 16 · Performing a "test 6 to 1 $, marked by the fact that a tax system is provided, about the occurrence of the disregard of the production of an oil stool automatissh su control Fittntanwalt 909845/0272 / Γ * Blank page